Abstract
The pure long-range ${1}_{u}$ state of an alkali-metal dimer is observed in ${}^{39}{\mathrm{K}}_{2}$ using photoassociative spectroscopy of ultracold atoms. High-resolution spectra for vibrational levels $v=\stackrel{\ensuremath{\rightarrow}}{0}7$ are recorded by resonance-enhanced two-photon ionization. Strong rotation-hyperfine couplings are observed. Major molecular constants and a hyperfine structure analysis are presented. This ${1}_{u}$ state is useful as an ungerade Franck-Condon ``window'' at large internuclear distance for studies of highly excited long-range interactions.
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